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[60.250.192.107]) by smtp.gmail.com with ESMTPSA id 41be03b00d2f7-7b762e9c2dasm3823210a12.8.2024.08.04.20.04.03 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sun, 04 Aug 2024 20:04:05 -0700 (PDT) From: Hui-Ping Chen To: vkoul@kernel.org, kishon@kernel.org, robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org Cc: linux-arm-kernel@lists.infradead.org, linux-phy@lists.infradead.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, Hui-Ping Chen Subject: [PATCH v4 2/2] phy: nuvoton: add new driver for the Nuvoton MA35 SoC USB 2.0 PHY Date: Mon, 5 Aug 2024 03:03:56 +0000 Message-Id: <20240805030356.14565-3-hpchen0nvt@gmail.com> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20240805030356.14565-1-hpchen0nvt@gmail.com> References: <20240805030356.14565-1-hpchen0nvt@gmail.com> Precedence: bulk X-Mailing-List: devicetree@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Nuvoton MA35 SoCs support DWC2 USB controller. Add the driver to drive the USB 2.0 PHY transceivers. Signed-off-by: Hui-Ping Chen --- drivers/phy/Kconfig | 1 + drivers/phy/Makefile | 1 + drivers/phy/nuvoton/Kconfig | 13 +++ drivers/phy/nuvoton/Makefile | 3 + drivers/phy/nuvoton/phy-ma35d1-usb2.c | 143 ++++++++++++++++++++++++++ 5 files changed, 161 insertions(+) create mode 100644 drivers/phy/nuvoton/Kconfig create mode 100644 drivers/phy/nuvoton/Makefile create mode 100644 drivers/phy/nuvoton/phy-ma35d1-usb2.c diff --git a/drivers/phy/Kconfig b/drivers/phy/Kconfig index dfab1c66b3e5..f73abff416be 100644 --- a/drivers/phy/Kconfig +++ b/drivers/phy/Kconfig @@ -95,6 +95,7 @@ source "drivers/phy/mediatek/Kconfig" source "drivers/phy/microchip/Kconfig" source "drivers/phy/motorola/Kconfig" source "drivers/phy/mscc/Kconfig" +source "drivers/phy/nuvoton/Kconfig" source "drivers/phy/qualcomm/Kconfig" source "drivers/phy/ralink/Kconfig" source "drivers/phy/realtek/Kconfig" diff --git a/drivers/phy/Makefile b/drivers/phy/Makefile index 5fcbce5f9ab1..ebc399560da4 100644 --- a/drivers/phy/Makefile +++ b/drivers/phy/Makefile @@ -25,6 +25,7 @@ obj-y += allwinner/ \ microchip/ \ motorola/ \ mscc/ \ + nuvoton/ \ qualcomm/ \ ralink/ \ realtek/ \ diff --git a/drivers/phy/nuvoton/Kconfig b/drivers/phy/nuvoton/Kconfig new file mode 100644 index 000000000000..270ee2943287 --- /dev/null +++ b/drivers/phy/nuvoton/Kconfig @@ -0,0 +1,13 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# PHY drivers for Nuvoton MA35 platforms +# +config PHY_MA35_USB + tristate "Nuvoton MA35 USB2.0 PHY driver" + depends on ARCH_MA35 || COMPILE_TEST + depends on OF + select GENERIC_PHY + help + Enable this to support the USB2.0 PHY on the Nuvoton MA35 + series SoCs. + diff --git a/drivers/phy/nuvoton/Makefile b/drivers/phy/nuvoton/Makefile new file mode 100644 index 000000000000..2937e3921898 --- /dev/null +++ b/drivers/phy/nuvoton/Makefile @@ -0,0 +1,3 @@ +# SPDX-License-Identifier: GPL-2.0 + +obj-$(CONFIG_PHY_MA35_USB) += phy-ma35d1-usb2.o diff --git a/drivers/phy/nuvoton/phy-ma35d1-usb2.c b/drivers/phy/nuvoton/phy-ma35d1-usb2.c new file mode 100644 index 000000000000..9a459b700ed4 --- /dev/null +++ b/drivers/phy/nuvoton/phy-ma35d1-usb2.c @@ -0,0 +1,143 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Copyright (C) 2024 Nuvoton Technology Corp. + */ +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +/* USB PHY Miscellaneous Control Register */ +#define MA35_SYS_REG_USBPMISCR 0x60 +#define PHY0POR BIT(0) /* PHY Power-On Reset Control Bit */ +#define PHY0SUSPEND BIT(1) /* PHY Suspend; 0: suspend, 1: operaion */ +#define PHY0COMN BIT(2) /* PHY Common Block Power-Down Control */ +#define PHY0DEVCKSTB BIT(10) /* PHY 60 MHz UTMI clock stable bit */ + +struct ma35_usb_phy { + struct clk *clk; + struct device *dev; + struct regmap *sysreg; +}; + +static int ma35_usb_phy_power_on(struct phy *phy) +{ + struct ma35_usb_phy *p_phy = phy_get_drvdata(phy); + unsigned int val; + int ret; + + ret = clk_prepare_enable(p_phy->clk); + if (ret < 0) { + dev_err(p_phy->dev, "Failed to enable PHY clock: %d\n", ret); + return ret; + } + + regmap_read(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, &val); + if (val & PHY0SUSPEND) { + /* + * USB PHY0 is in operation mode already + * make sure USB PHY 60 MHz UTMI Interface Clock ready + */ + ret = regmap_read_poll_timeout(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, val, + val & PHY0DEVCKSTB, 10, 1000); + if (ret == 0) + return 0; + } + + /* + * reset USB PHY0. + * wait until USB PHY0 60 MHz UTMI Interface Clock ready + */ + regmap_update_bits(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, 0x7, (PHY0POR | PHY0SUSPEND)); + udelay(20); + + /* make USB PHY0 enter operation mode */ + regmap_update_bits(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, 0x7, PHY0SUSPEND); + + /* make sure USB PHY 60 MHz UTMI Interface Clock ready */ + ret = regmap_read_poll_timeout(p_phy->sysreg, MA35_SYS_REG_USBPMISCR, val, + val & PHY0DEVCKSTB, 10, 1000); + if (ret == -ETIMEDOUT) { + dev_err(p_phy->dev, "Check PHY clock, Timeout: %d\n", ret); + clk_disable_unprepare(p_phy->clk); + return ret; + } + + return 0; +} + +static int ma35_usb_phy_power_off(struct phy *phy) +{ + struct ma35_usb_phy *p_phy = phy_get_drvdata(phy); + + clk_disable_unprepare(p_phy->clk); + return 0; +} + +static const struct phy_ops ma35_usb_phy_ops = { + .power_on = ma35_usb_phy_power_on, + .power_off = ma35_usb_phy_power_off, + .owner = THIS_MODULE, +}; + +static int ma35_usb_phy_probe(struct platform_device *pdev) +{ + struct phy_provider *provider; + struct ma35_usb_phy *p_phy; + struct phy *phy; + + p_phy = devm_kzalloc(&pdev->dev, sizeof(*p_phy), GFP_KERNEL); + if (!p_phy) + return -ENOMEM; + + p_phy->dev = &pdev->dev; + platform_set_drvdata(pdev, p_phy); + + p_phy->sysreg = syscon_regmap_lookup_by_phandle(pdev->dev.of_node, "nuvoton,sys"); + if (IS_ERR(p_phy->sysreg)) + return dev_err_probe(&pdev->dev, PTR_ERR(p_phy->sysreg), + "Failed to get SYS registers\n"); + + p_phy->clk = of_clk_get(pdev->dev.of_node, 0); + if (IS_ERR(p_phy->clk)) + return dev_err_probe(&pdev->dev, PTR_ERR(p_phy->clk), + "failed to find usb_phy clock\n"); + + phy = devm_phy_create(&pdev->dev, NULL, &ma35_usb_phy_ops); + if (IS_ERR(phy)) + return dev_err_probe(&pdev->dev, PTR_ERR(phy), "Failed to create PHY\n"); + + phy_set_drvdata(phy, p_phy); + + provider = devm_of_phy_provider_register(&pdev->dev, of_phy_simple_xlate); + if (IS_ERR(provider)) + return dev_err_probe(&pdev->dev, PTR_ERR(provider), + "Failed to register PHY provider\n"); + return 0; +} + +static const struct of_device_id ma35_usb_phy_of_match[] = { + { .compatible = "nuvoton,ma35d1-usb2-phy", }, + { }, +}; +MODULE_DEVICE_TABLE(of, ma35_usb_phy_of_match); + +static struct platform_driver ma35_usb_phy_driver = { + .probe = ma35_usb_phy_probe, + .driver = { + .name = "ma35d1-usb2-phy", + .of_match_table = ma35_usb_phy_of_match, + }, +}; +module_platform_driver(ma35_usb_phy_driver); + +MODULE_DESCRIPTION("Nuvoton ma35d1 USB2.0 PHY driver"); +MODULE_AUTHOR("Hui-Ping Chen "); +MODULE_LICENSE("GPL"); -- 2.25.1